Machinery Repairman

Figure 9-14.—Step block.
Figure 9-15.—Application of step block and clamp.
Holding the Work
The various accessories used to hold planer or
shaper work may make the difference between a
superior job and a poor job. There are no set rules on
the use of planer accessories to clamp down a piece of
work—results will depend on your ingenuity and
experience.
One way to hold down work on the worktable is by
using clamps atached to the worktable by bolts inserted
in the T-slots. Figure 9-14 shows a step block that you
can use with clamps when you need to clamp an
irregularly shaped piece of work to the planer table. One
way to do this is illustrated in figure 9-15; where an
accurately machined step block is used with a
gooseneck clamp. Figure 9-16 illustrates correct and
incorrect ways to apply clamps.
You can use jacks of different sizes to level and
support work on the planer table. The conical point
screw (fig. 9-17, B) replaces the swivel pad-type screw
for use in a comer. You can use extension bases (fig.
9-17, C, D, E, and F) to increase the effective height of
the jack
Figure 9-16.—Correct and incorrect clamp applications.
Figure 9-17.—Planer jack and extension bases.
PANTOGRAPHS
The pantograph (engraving machine) is essentially
a reproduction machine. It is used in the Navy to
engrave letters and numbers on label plates, to engrave
workpiece. You can use it to engrave flat and uniformly
curved surfaces.
There are several different models of engraving
and graduate dials and collars, and in other work that machines that you may have to operate. Figure 9-18
requires the exact reproduction of a flat pattern on the shows one model that mounts on a bench or a table top
9-14